Air becomes less dense and rises when ________.
A. the air warms
B. atmospheric pressure decreases
C. the water vapor content increases
D. All of these are correct.
E. None of these is correct.
Answer: D
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________ of urban residents in developing countries have satisfactory sanitation services.
A. Less than 10 percent B. Nearly all C. Less than half D. 70-80 percent
Long lasting, steady rainfall
What will be an ideal response?
The long profile of a glaciated valley floor is ________
A) a smooth curve B) irregular C) logarithmic D) steep E) flat
The use of hydrogen gas would eliminate most of the air pollution problems we have today because:
a. When it burns it combines with carbon dioxide and removes it from the air. b. When it burns it combines with water to produce heavy rainwater. c. When it burns it combines with oxygen gas in the air to produce water vapor. d. When it burns it combines with carbon to produce methane gas. e. More than one of the answers is correct.